Booster seat



FIG. 1 is a perspective view of a booster seat in accordance with our new design;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a rear view of FIG. 1;

FIG. 4 is a top view of FIG. 1;

FIG. 5 is a bottom view of FIG. 1;

FIG. 6 is a left side view of FIG. 1; and,

FIG. 7 is a right side view of FIG. 1. 

CLAIM The ornamental design for a booster seat, as shown and described. 